Improvement in paper-pulp screens and dressers



UNIT D S'rA'rEs a'rniv'r FFICE.

JOHN S. WARREN, OF FISHKILL 5 ON THE HUDSON, EVV YORK.

IMPROVEMENT IN PAPER-PULP SCREENS AND DRESSER? Specification formingpart of Letters Patent No. 11 337217, dated February 17, 1874;application filed December 1, 1873.

To all whom it may concern:

Be it known that I, JOHN S. WARREN, of Fishkill-on-the-Hudson, Dutehesscounty, and State of New York, have invented a new and usefulImprovement in Paper-Pulp Screen and Dresser, of which the following isa specification: i:-

Figure 1 is a top view of my improved screen, the top screen-plate beingremoved. Fig. 2 is a detail'vertical longitudinal section of the same,taken through the line a m, Fig. 1. Fig. 3 is a detail verticalcross-section of the same, taken through the line 3 y, Fig. 1.

The invention will first be fully described, and subsequently pointedout in the claims.

A represents the vat into which the pulp is put to be operated upon. Bis a shaft, which passes longitudinally through the vat A, and revolvesin bearings attached to the ends of said vat. To one of the projectingends of the shaft B is attached a pulley, O, to which the power isapplied. To the end of the shaft B is attached a small gear-wheel, D,into the teeth of which mesh the teeth of the large gearavheel Eattached to the outer end of the short shaft F, which revolves inbearings atvof the screen I, so that the said screen I may be revolvedvery slowly while the shaft B is revolved much more rapidly.

The screen I may be made with four or any desired number of sides, andits sides are slotted in the manner of ordinary paper-pulpscreen-plates.

One end of the screen I revolves loosely upon the shaft B, and in thecenter of its other end is formed a large hole, in which is inserted ashort tube, J, which revolves in or upon a short tube, K, secured in ahole in the end of the vat A. The tubes J K open into a tube or spout,L, attached to the end of the vat A, and from the upper end of which thepulp is discharged. To the shaft B within the tubes J K, and fittinginto the inner one of said tubes,

is attached a small propeller-screw, M, to draw 7 the pulp from thescreen I, and force it out through the spout L, enabling it to bedischarged at a higher level than the point at which the pulp stands inthe vat A. To the shaft B, within the screen I, are attached four ormore oblique plates, N, inclined in opposite directions with respect toeach other, and which are carried around by and with the shaft B initsrevolution, so as to give the necessary pulsations to the pulp to drawit through the slits of the screen-plates forming the sides of thescreen I.

I11 large machines, the plates N may have their outer parts curved inopposite directions to give more pulsations to the pulp.

In the plates N, near their centers, are formed openings 0, to allow thepulp to pass through as it passes toward the dischargeopening. To theangles of the screen I are attached plates P, which proj ect toward theshaft B, between the plates N, and are designed to prevent the pulpwithin the screen. I from receiving a rotary movement from the frictionof the plates N. To the angles of the screen 1, especially when saidscreen is made with more than four sides, are attachedoutwardlyprojecting flanges Q, to give the proper agitation to the pulpwithin the vat A.

Having thus described my invention, Iclaim as new and desire to secureby Letters Patent-- 1. The oblique pulsation-plates N, inclined inopposite directions from each other, in combination with the shaft B andscreen I, rotating at different velocities, and with the vat A,substantially as herein shown and described.

2. The combination of the inwardly-project- IVitnesses: JAMES T. GRAHAM,

T. B. Mosnnn.

